Auxiliary drive system for steel rolling mills

Claim 1

IN A ROLLING MILL OF THE TYPE INCLUDING (A) WORK ROLLS, (B) A MAIN DRIVE SYSTEM FOR NORMALLY OPERATING THE WORK ROLLS COMPRISING A MAIN MOTOR, PINIONS DRIVEN BY THE MAIN MOTOR, AND COUPLINGS CONNECTING THE PINIONS TO THE WORK ROLLS, AND (C) AN AUXILIARY DRIVE SYSTEM FOR OPERATING THE ROLLING MILL WHEN THE MAIN MOTOR IS OFF TO SLOWLY TURN THE PINIONS AND ALIGN THE COUPLINGS IN A SUITABLE POSITION TO FACILITATE CHANGE OF THE WORK RILLS, IN IM PROVED AUXILIARY DRIVE SYSTEM COMPRISING, IN COMBINATION: (1) AN AUXILIARY DRIVE MOTOR; (2) A HYDRAULIC CLUTCH INCLUDING A FIRST ROTATABLE MEMBER, A SECOND ROTATABLE MEMBER CONNECTED TO THE MAIN MOTOR, AND AN EXPANDLE GLAND ATTACHED TO ONE OF SAID MEMBERS AND ADAPTED TO EXPAND WHEN FILLED WITH FLUID TO FORM A DRIVING CONNECTION BETWEEN THE FIRST AND SECOND MEMBERS; (3) SPEED REDUCTION GEARING CONNECTING THE AUXILIARY DRIVE MOTOR TO THE FIRST ROTATABLE MEMBER OF THE CLUTCH; (4) A HYDRAULIC PUMP DRIVEN BY THE AUXILIARY DRIVE MOTOR; (5) A HIGH PRESSURE FLUID SUPPLY LINE LEADING FROM THE PUMP TO THE EXPANDIBLE GLAND OF THE CLUTCH SO THAT FLUID CAN BE SUPPLIED TO EXPAND THE GLAND TO FORM THE AFORESAID DRIVING CONNECTION; (6) A FLUID RESERVOIR; AND (7) A FLUID RETURN LINE FOR SUPPLYING FLUID TO THE HYDRAULIC PUMP FROM THE RESERVOIR.